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Transport of the plasma with neoclassical internal transport barrier on CHS

T Minami, A Fujisawa, H Iguchi, S Murakami, M Yokoyama, Y Yoshimura, M Isobe, S Nishimura, C Suzuki, I Nomura2002年Plasma Physics and Controlled FusionIF 2.2出版社

The plasma with neoclassical internal transport barrier (N-ITB)has been observed for electron cyclotron heated (ECH) plasma in the Compact Helical System Heliotron/Torsatron. The N-ITB is characterized by the peaked electron temperature,with a large temperature gradient (0.43 keV cm-1) and a large electric field shear at the barrier location.The transport analysis shows that the electron thermal conductivity in plasma with N-ITB is lower than that without N-ITB at the transport barrier. The neoclassical transport is calculated from the analytical model for the neoclassical particle flux.In the ECH plasma with N-ITB, the electron thermal conductivity χe is at the level of the neoclassical χe at the barrier transport which demonstrates that the anomalous transport is reduced to a level well below the neoclassical transport.

日本語訳

新古典内部輸送障壁(N-ITB)を有するプラズマは、コンパクトヘリカルシステム(Heliotron/Torsatron)において電子サイクロトロン加熱(ECH)プラズマで観測されている。N-ITBは、尖った電子温度分布によって特徴づけられ、障壁位置において大きな温度勾配(0.43 keV cm⁻¹)と大きな電場シアを有する。輸送解析により、N-ITBを有するプラズマ中の電子熱拡散係数は、輸送障壁位置においてN-ITBを有しないプラズマ中のそれよりも低いことが示されている。新古典輸送は、新古典粒子束に対する解析モデルから計算される。ECHプラズマ中のN-ITBにおいて、電子熱拡散係数χeは輸送障壁位置における新古典χeのレベルにあり、これは異常輸送が新古典輸送をはるかに下回るレベルまで低減されていることを示している。

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Transport barrierInternal transport barrierCompact Helical System
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